Abstract
Intracellular growth ofLegionella pneumophila, an opportunistic intracellular bacterium considered the cause of legionellosis, was assessed in peritoneal macrophages from normal and immunized guinea pigs. These bacteria grew exceedingly well in the normal guinea pig macrophages. Uptake of these bacteria was about the same by macrophages from either normal or immune guinea pigs, but their growth in immune macrophages was completely inhibited. Macrophages from normal guinea pigs stimulated with mezerin, a compound similar to diterpene ester, a known nonspecific stimulator of macrophages, or with specificLegionella vaccine released moderate or only small amounts of hydrogen peroxide, an indicator of macrophage activation to antimicrobicidal activity. In contrast, macrophages from immune guinea pigs produced much higher levels of hydrogen peroxide when stimulated with mezerein or theLegionella vaccine, and also showed a heightened response when cultured without a stimulator. These results indicate that macrophage activation related to the immune status of the host appears to have an important role in initial resistance toLegionella growth in susceptible individuals.
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Yamamoto, Y., Klein, T.W. & Friedman, H. Legionella pneumophila intracellular growth in normal vs. Immune guinea pig macrophage cultures. Current Microbiology 16, 333–336 (1988). https://doi.org/10.1007/BF01568541
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DOI: https://doi.org/10.1007/BF01568541